Elevators



Aug. 13, 1957 F. DE Los sANTos IZQUIERDQ ETAL 2,802,549

ELEVATORS Filed Aug. 5, 1955 3 Sheets-Sheet 2 Aug. 13, 1957 F. DE LosSAN-ros lzQun-:Rno ETAL 2,802,549

ELEvAToRs Filed Aug. 5, 1955 3 Sheets-Sheet 5 j 2| iz 16 /m/funwsF12-'parma 'v ma fol/ros /zqu/Expo ma Mor/Ma -z/Maz oas-z United Sttesate ELEVATDRS Federico de los Santos Izquierdo and Maximo Muoz Lopez,Mexico City, Mexico Application August 5, 1955, Serial No. 526,582 f 3Claims. (Cl. IS7- 25) The present invention relates, in general, toelevators andhoists and, more particularly, refers to certain use fulimprovements in apparatus and installations of this kind, which providea completely novel and original drlvr ing system or transmission ofmovement, which offers great advantages over all those heretofore usedand known.

The drive system, or system for the transmission of movement, for theelevators and hoists of our invention, is characterized substantially inthat the cables, pulleys, and hoists which, together with the motor,draw the. elevator, are substituted with two fixed screws and tworotating nuts mounted on the elevator cab, which nuts rotate along thetwo screws by means of the drive from a motor which likewise is mounteddirectly on said elevator cab or box. By means of the rotating movementof the nuts, the elevator goes up and down along the screws.

Among the advantages oered by this new elevator system, the followingmay be mentioned:

It is the only elevator whose source of power and movement is situateddirectly in its cab or box. Therefore it is the only one provided withautonomous or independent movement, in contrast with those used andknown heretofore, which have their motor or source of power installed inthe upper or lower part of the building and therefore independently ofthe elevator proper.

lts general structure and component parts are much simpler since itamounts, essentially, to two screws with their nuts anda motor to drivethe latter.

It is safer inasmuch as its operation does not depend exclusively on thecable, for drawing and supporting the elevator, as is the case with theelevators used heretofore.

In the present elevator, of the invention, it is imposn sible for thethreads of the screws to become worn or break along the length of saidscrews, which is the only possible cause of a fall or accident.

The installation is easier and more economical since it simply amountsto two vertical screws which serve as a guide for the entire system.

A greater output is obtained in the present elevator since there arefewer masses to place in movement and less friction and, consequently, areduced loss of power through friction.

A greater speed can be obtained, along with more safety and a higheroutput, as indicated above.

These and other advantages, details, features, and dierences with regardto known apparatus, will be made clearly evident in the course of thefollowing description, as also in the drawings attached hereto inillustration thereof, the same reference numbers being used in saiddrawings to indicate the same parts in the six gures shown.

In said drawings:

Fig. l is an elevational view of the front of an elevator like that ofthe invention, partly broken at its ower portion to show its drive orsystem for transmitting movement.

2,802,549 Patented Au'g. 13, `1957 Fig. 2 is likewise a view in sideelevation of the same elevator shown in the preceding figure.

Fig. 3 shows a detail in vertical section of the clutch for the system.

Fig. 4 shows, in elevation, a detail of the screw and its attachment tothe beams.

Fig. 5 shows a transverse section of the screw along line A--A of Fig.`4; and

1. Fig. 6 illustrates an elevation in vertical section of the nut withits ball bearings and cages.

Before describing in `detail the new drive, or system of transmission ofmovement, to elevators or hoists, according to our invention, and as itis shown in the attached drawings, it should be clearly understood thatsaid drawings illustrate only by way of example one of preferred formsof practicing the invention, but without limiting the latter to thespecific details illustrated. and described. vTherefore it should beunderstood that'the invention covers anyI type or model of elevator, forper-V sons or for freight, to which the present system can be applied,or in other words: two or more rotating nuts which rotate on two or morescrews, by means of a motor installed in the cage or cab proper of theelevator; all, of course, without deviating from the principles of theinvention and within the scope of the claims given at the end of thisdescription.

As illustrated enunciatively in the attached drawings and particularlyin Fig. l thereof, on either side of the elevator cab 10 there is ascrew 11, each of said screws being xed in a vertical position and inparallelism, although they can also operate in a more or less inclinedposition. Said screws 1l are secured, at their two ends, to two beams orcross members 12, situated at the upper and lower parts (notillustrated) of the building or industrial installation. Said screws 11are preferably two in number, as seen in said Fig. l, and are secured inparallel relation at a suitable distance so that the cage og cab l@ ofthe elevator may operate and slide between t em.

Said screws lll act also as guides for cab 10 since the latter providestwo tubular parts 13 which embrace screws 11 like a sleeve and slidealong their entire length.

It is the nuts 14 (Fig. 6, in detail) which effect the movement oftranslation from above to below and vice versa, since they slide alongscrews 11 due to the rotation of said nuts. For attachment and safetypurposes, said nuts 14 are mounted in cages 15 on ball bearings 16,having a radial and axial action (Fig. 6 of the drawings), for thepurpose of reducing the friction and, consequently, the wear, to aminimum. For the rotational movement of each of said nuts 14, theycarry, rmly attached thereto, a sheave 17 for the band V which in turnis driven by bands i8 (Figs. l and 2), pulley 19, and motor 20, situatedbeneath the cab 10 of the elevator, as seen in Fig. l of the drawings.

The drive or transmission from motor Zit to pulley 19, secured to theshaft thereof, is effected by means of a friction clutch 21 (Fig. 3)and, as indicated previously, the motor and the drive mechanism aremounted and secured beneath the floor 22 of the elevator, Where they aresecured by means of structures 23 and 24. For the operation of saidclutch 2l, there are provided wedges 25, actuated in the usual manner.

For the purpose of leveling the load and reducing the strain on themotor 2t), the cab 10 of the elevator has a counterweight device 26(Fig. 2), secured to the cables Z7 and pulleys 2S, by means ofintervening collars 29 and springs 30. The pulleys 28 are secured tobeams 31.

Fig. 4 of the attached drawings shows in detail screw 11 which ismounted in sections on the polygonal tube 32, so that the sectionsremain fixed and do not turn. Through said polygonal tube 32 passeslongitudinally cable 33 which crosses beamlz and is fastened with a tie34, clamp 35 and studs 36. Between the tie or loop 34 and beam 12 thereis a spring 37 which forces cable 33 to be completely under tension,absorbing etects of dilation due to temperature changes and regulatingsaid tension.

Finally the mouth piece 38 -fixes the position of the polygonal tube 32(Fig. 4 of the drawings) and is secured to beam 12 by means of threadedbolts and nuts 39.

Fig. 5 of the drawings illustrates screw 11 in transverse section,showing very clearly the arrangements of its parts, namely: cable 33 atthe center; polygonal tube 32 through which said cable passes; and, tothe outside, after the manner of a sleeve or cover, screw 11 along whichrotates nut 14 which is driven by elevator 10 by means of the power ofmotor 20 and pulleys 19 and 17.

We claim:

, 1. An elevator structure comprising a cage, a plurality ofnon-rotatable screws xedrat the opposite sides of the cage and disposedalong the entire length of the path of movement of the cage, a tubularmember attached to each side of the cage through which passes acorresponding screw to serve as guides for the cage, a nut rotatablymounted on each screw, a motor supported beneath the cage, means fortransmitting motion from said motor to said nuts, a supporting beam forthe elevator structure, a polygonal-shaped tube attached to the beam ateach side of the cage, and a cable passing through each tube andattached to the beam, each screw comprising a plurality of sectionsmounted non-rotatably on its corresponding tube.

2. An elevator structure as set forth in claim 1, wherein the means forattaching the polygonal tube to the beam comprises a member secured tothe beam and having a polygonal-shaped opening receiving the end of thetube to hold the tube in fixed and non-rotatable position.

3. An elevatorV structure as set forth in claim 1, wherein each tubularcage guiding member is provided with a housing to receive the rotatableVnut.

References Cited in the tileof this patent UNITED STATES PATENTS 479,390Calcutt July 19, 1892 765,347 Vogel July 19, 1904 1,263,303 Wolf Apr;16, 1918 2,527,897 Todd Oct. 31, 1950

